Are we saying that Microblogs can be used only with Social Office? Can't I build it from source and deploy in portal 6.1.x?

Regards,Nilesh

It should work (I have seen it work), but it's not guaranteed to work now or in the future, as it's not a standalone, supported app. So if, for example, you're paying for support for Liferay Portal EE, and you use the Microblogs portlet by itself, and there's a bug that prevents it from working without the rest of Social Office, then that bug would take a backseat to bugs on supported configurations.

Of course, via the awesomeness of open source, you could always fix these hypothetical bugs and submit them back as contributions